<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<?php
$myimage = "http://www.jztzp.com/show-img?src=http%3A//s12.sinaimg.cn/middle/4b5570a2ha5965a877ecb%26690&ref=http%3A//blog.sina.com.cn/s/blog_4b5570a20100vlmx.html";
$size = getimagesize($myimage);
?>

then use the following in your HTML:

<?php 
echo $size[0];
echo $size[1];
echo $size[2];
echo $size[3]; 
?>

